package com.example.firstspringboot.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;

@Configuration
public class CorsConfig {
    private CorsConfiguration buildConfig() {
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        corsConfiguration.addAllowedOrigin("*");          // 1允许任何域名使用
        corsConfiguration.addAllowedHeader("*");        // 2允许任何头
        corsConfiguration.addAllowedMethod("*");        // 3允许任何方法（get、post、put、delete、options等）
        corsConfiguration.setMaxAge(3600L);              // 跨域时长（可选项）
        return corsConfiguration;
    }

    @Bean
    public CorsFilter corsFilter() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", buildConfig());      // 4注册
        return new CorsFilter(source);
    }
}